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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 
    Updike, A. C; Haislip, J. B; Nysewander, M. C; Fruchter, A. S; Kann, D. A; Klose, S; Milne, P. A; Williams, G. G; Zheng, W; Hergenrother, C. W; Prochaska, J. X; Prochaska, J. X; Mirabal, N; Thorstensen, J. R; van der Horst, A. J; Starling, R. L. C; Racusin, J. L; Burrows, D. N; Kuin, N. P. M; Roming, P. W. A; Bellm, E; Hurley, K; Li, W; Filippenko, A. V; Blake, C; Starr, D; Falco, E. E; Brown, W. R; Dai, X; Deng, J; Xin, L; Qiu, Y; Wei, J; Urata, Y; Nanni, D; Palazzi, E; Greco, G; Bartolini, C; Guarnieri, A; Piccioni, A; Pizzichini, G; Terra, F; Misra, K; Bhatt, B. C; Anupama, G. C; Fan, X; Jiang, L; Wijers, R. A. M. J; Reichart, D. E; Eid, H. A; Bryngelson, G; Puls, J; Goldthwaite, R. C; Hartmann, D. H (The American Astronomical Society, 2008-09)
    We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and ...
  • Rapidly Rotating Strange Stars for a New Equation of State of Strange Quark Matter 
    Bombaci, I; Thampan, A. V; Datta, B (The American Astronomical Society, 2000-10)
    For a new equation of state of strange quark matter, we construct equilibrium sequences of rapidly rotating strange stars in general relativity. The sequences are the normal and supramassive evolutionary sequences of ...
  • Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7 
    Rakshit, S; Stalin, C. S; Hota, A; Konar, C (IOP Publishing, 2018-12)
    Among the many varieties of active galactic nuclei (AGNs) known, narrow-line Seyfert 1 (NLSy1) galaxies are a puzzling class, particularly after the discovery of γ-ray emission in a handful of them using observations from ...
  • A Raspberry Pi-based attitude sensor 
    Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar; Mohan, Rekhesh; Akshata Nayak; Safonova, M; Murthy, J (World Scientific Publishing Co., 2014-11)
    We have developed a lightweight low-cost attitude sensor, based on a Raspberry Pi, built with readily available commercial components. It can be used in experiments where weight and power are constrained, such as in ...
  • [Rb/Zr] ratio in Ba stars as a diagnostic of the companion AGB stellar mass 
    Shejeelammal, J; Goswami, A (Indian Academy of Sciences, 2020-12)
    Understanding nucleosynthesis in and evolution of asymptotic giant branch (AGB) stars is of primary importance as these stars are the main producers of some of the key elements in the Universe. They are the predominant ...
  • Re-analysis of close binary systems 
    Indulekha, K; Kundt, W; Shylaja, B. S (Kluwer Academic Publishers, 1990-10)
    The facts indicating that large line-forming regions occur among the best-studied close binaries are outlined. It is pointed out that emission lines are often redshifted while absorption lines are blueshifted, emission ...
  • Re-Analysis of QPO in 3C 273 Light Curve 
    Mohan, Prashanth; Mangalam, A; Chand, H; Gupta, A. C (Indian Academy of Sciences, 2011-06)
    We have developed analysis tools to search for quasi periodic oscillations in light curves from active galactic nuclei, using the following time series techniques: Wavelets, periodogram, Lomb–Scargle periodogram, structure ...
  • Re-appraisal of the P,T-odd interaction constant Wd in YbF: relativistic configuration interaction approach 
    Nayak, M. K; Chaudhuri, R. K (Indian Academy of Sciences, 2009-09)
    Restricted active space (RAS) configuration interaction (CI) approach is employed to compute the P,T-odd interaction constant W-d for the ground ((2)Sigma(1/2)) state of YbF molecule. The present estimate of W-d = -1.164 ...
  • Real-time discovery of AT2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta 
    Perley, Daniel A; Ho, Anna Y. Q; Yao, Yuhan; Fremling, Christoffer; Anderson, Joseph P; Schulze, Steve; Kumar, Harsh; Anupama, G. C; Barway, Sudhanshu; Bellm, Eric C; Bhalerao, Varun; Chen, Ting-Wan; Duev, Dmitry A; Galbany, Llu´ıs; Graham, Matthew J; Gromadzk, Mariusz; Gutierrez, Claudia P; Ihanec, Nada; Inserra, Cosimo; Kasliwal, Mansi M; Kool, Erik C; Kulkarni, S. R; Laher, Russ R; Masci, Frank J; Neill, James D; Nicholl, Matt; Pursiainen, Miika; Roestel, Joannes van; Sharma, Yashvi; Sollerman, Jesper; Walters, Richard; Wiseman, Philip (Oxford University Press on behalf of Royal Astronomical Society, 2021-12)
    The many unusual properties of the enigmatic AT2018cow suggested that at least some subset of the empirical class of fast blue optical transients (FBOTs) represents a genuinely new astrophysical phenomenon. Unfortunately, ...
  • Real-time wind speed measurement using wavefront sensor data 
    Roopashree, M. B; Vyas, A; Prasad, B. R (SPIE-The International Society for Optical Engineering, 2010-02)
    Real-time measurement of effective wind speed helps in continuous monitoring of the temporal bandwidth in adaptive optics systems. In this paper, we propose a simple and efficient method for estimating wind speed from ...
  • Reappearance of McNeil’s Nebula (V1647 Orionis) and its Outburst Environment 
    Ninan, J. P; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Mohan, V; Mallick, K. K; Tamura, M; Henning, T (IOP Publishing, 2013-12-01)
    We present a detailed study of McNeil's nebula (V1647 Ori) in its ongoing outburst phase starting from 2008 September to 2013 March. Our 124 nights of photometric observations were carried out in optical V, R, I, and ...
  • Reappraisal of cis effect in 1,2-dihaloethenes: An improved virtual orbital multireference approach 
    Chaudhuri, R. K; Hammond, J. R; Freed, K. F; Chattopadhyay, S; Mahapatra, U. S (American Institute of Physics, 2008-08)
    Computed relative stabilities for isomers of 1,2-difluoroethene and 1,2-dichloroethene isomers are compared with predictions based on chemical hardness (η) and electrophilicity (ш) using the principles of maximum hardness ...
  • Reappraisal of Nuclear Quadrupole Moments of Atomic Halogens via Relativistic Coupled Cluster Linear Response Theory for the Ionization Process 
    Chaudhuri, R. K; Chattopadhyay, S; Mahapatra, U. S (American Chemical Society, 2013-11-27)
    The coupled cluster based linear response theory (CCLRT) with four-component relativistic spinors is employed to compute the electric field gradients (EFG) of $^{35}$Cl, $^{79}$Br, and $^{127}$I nuclei. The EFGs resulting ...
  • Reappraisal of the Electric Dipole Moment Enhancement Factor for Thallium 
    Nataraj, H. S; Sahoo, B. K; Das, B. P; Mukherjee, D (American Physical Society, 2011-05-20)
    The electric dipole moment (EDM) enhancement factor of atomic Tl is of considerable interest as it has been used in determining the most accurate limit on the electron EDM to date. However, its value varies from -179 to ...
  • Recent advances in RV Tauri stars 
    Giridhar, S (Indian Academy of Sciences, 2020-12)
    The availability of multi-wavelength observations and parallaxes from the space missions and very comprehensive models of AGB evolution that include the accretion of matter from the circumbinary disc have strongly impacted ...
  • Recent Developments in Polarized Line Formation in Magnetic Fields 
    Nagendra, K. N; Sampoorna, M; Anusha, L. S (Springer, 2010)
    The nature of solar surface magnetism has been an open problem in solar physics. In this paper we address three frontline problems of spectropolarimetry of the Sun. We first review the theoretical formulation and numerical ...
  • Recent mass loss episode of the Be Star omicron And 
    Ghosh, K. K; Jaykumar, K; Rosario, M. J; Appakutty, M (Konkoly Observatory, 1986-05)
  • Recent onset of an outburst in mu centauri 
    Ghosh, K. K; Velu, C; Kuppuswamy, K; Jaykumar, K; Rosario, M. J (Konkoly Observatory, 1987-08)
  • Recent outburst of U ScorpII 
    Shylaja, B. S; Prabhu, T. P (Indian Institute of Astrophysics, 1979-11)
    A photoelectric scan of Hβ and a photographic spectrum between λλ 4500-7000 obtained during the 1979 outburst of the recurrent nova U Sco have been studied. The electron density and the mass of ionized hydrogen in the nova ...
  • Recent photometry of HR 1099 (V711 Tau) 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Jayakumar, K; Rosario, M. J (Konkoly Observatory, 1982-08)

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